Question

If a man who has Duchenne muscular dystrophy has kids with a woman who does not have or carry the allele, how many of their sons could have the disorder?

A. None


B. All

Answer 1

None of the sons could have the disorder

Answer 2

The answer is none. Since DMD is a recessive x-linked trait, the sons will receive the Y from the father, and an X from the mother. Since the mother does not have the disease and is not a carrier, the sons cannot get the recessive x.